Well, if I had to guess, and this is only a guess, by analyzing the recurring trends of the last two installments, we have Indexes of two Silver Age characters and one Silver Age group. Plus the series would probably be long enough to have write-ups that take up over a dozen Index issues. Plus two of the Index characters coincided with movie releases of said characters.

The chronicle of the Marvel Universe returns, delving into the history of three more of the House of Ideas’ most enduring titles! Return with us to the far-out ’70s and the gritty ’80s as we launch our coverage of Wolverine (from 1982’s WOLVERINE #1), the Punisher (from 1986’s PUNISHER #1) and Ghost Rider (from 1972’s MARVEL SPOTLIGHT #5). Watch the Marvel Universe’s history unfold month by month as each issue provides synopses for dozens of individual comics, including backup strips — introducing the characters, teams, places and equipment that appeared within; and providing vital information about first appearances, where they last showed up and where they appeared next!
64 PGS./Rated A …$3.99

I would have loved a Fantastic Four / Hulk / Daredevil, but this one will do too

Will this serie have 14 issues too ? Even with multiple titles, various limited series and one-shots, it seems hard for these characters to reach the more than 600 issues of Amazing Spider-Man or Avengers, no ?

No, this series will be shorter than the previous two. That's one of the reasons these contents were selected -- the previous series were *intended* to be twelve issues each, but both of them managed to creep beyond that. This short series is intended to "reset the clock".

It also ties into the Ghost Rider and Wolverine movies slated for 2012, as well as the recent relaunches of Punisher and Ghost Rider. All around, it's covering some pretty timely material. I'm excited.